<html lang="en">
<head>
    <title>Sorry, that's a 500!</title>
    <style>
        body {
            background-color: #f9f9f9;
        }

        .container {
            display: flex;
            align-items: center;
            justify-content: center;
            height: 100%;
        }

        h1 {
            font-size: 4em;
            color: #4f95d1;
            font-family: ui-sans-serif, system-ui, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
        }
    </style>
</head>
<body>
<div class="container">
    <h1>500</h1>
</div>
</body>
</html>